package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
//营业额统计
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
//        当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
//            日期计算,计算指定日期后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

//        存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date: dateList){
//            查询date日期对应的营业额数据,营业额是订单状态为已完成的订单金额之和
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

// 用户统计
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
//        存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

//        存放每天的新增用户数量
        List<Integer> newUserList = new ArrayList<>();
//        存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date: dateList){{
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("end",endTime);

//            总用户数量
            Integer totalUser = userMapper.countByMap(map);
//            新增用户数量
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }}

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

// 订单统计
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
//        存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
//        存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
//        存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
//        遍历dateList集合,查询每天的有效订单数和订单总数
        for (LocalDate date: dateList){
//            查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime enDTime = LocalDateTime.of(date,LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, enDTime, null);
//            查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, enDTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
//        计算时间区间内的订单总总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
//        计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
//        计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .validOrderCount(validOrderCount)
                .totalOrderCount(totalOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }


    //根据条件统计订单数量
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status){
        Map map = new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);

        return orderMapper.countByMap(map);
    }

//    销量TOP10
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTOP10 = orderMapper.getSalesTOP10(beginTime, endTime);
        List<String> names = salesTOP10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");

        List<Integer> numbers = salesTOP10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");
//封装返回结果数据
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

//    导出运营数据报表
    public void exportBusinessData(HttpServletResponse response) {
//        查询数据库,获取营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
//      查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
//        通过POI将数据写入Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
//        基于模板文件创建新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
//          填充数据 ---  时间
            XSSFSheet sheet = excel.getSheetAt(0);
            sheet.getRow(1).getCell(1).setCellValue("时间:"+dateBegin + "至" + dateEnd);
//          获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
//          获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

//            填充明细数据
            for (int i = 0; i < 30; i++){
                LocalDate date = dateBegin.plusDays(i);
//                查询每一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

//                获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

//            通过输出流将文件下载到本地客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

//            关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}



























